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mq: create patch file after commit to import diff of ".hgsubstate" at qrefresh

Even though the committed revision contains diff of ".hgsubstate", the
patch file created by qrefresh doesn't contain it, because:

  - ".hgsubstate" is not listed up as one of target files of the patch
    for reasons below, so diff of ".hgsubstate" is not imported into
    patch file

      - status of ".hgsubstate" in working directory is usually "clean"
      - ".hgsubstate" is not specified explicitly by users

  - the patch file is created before commit processing which updates
    or creates ".hgsubstate" automatically, so there is no diff for it
    at that time

This patch resolves this problem by:

  - putting ".hgsubstate" into target list of the patch, if needed:
    this allows "patch.diff()" to import diff of ".hgsubstate" into
    patch file.

  - creating the patch file after commit processing:
    this updates ".hgsubstate" before "patch.diff()" invocation.

For the former fixing, this patch introduces "putsubstate2changes()"
to share same implementation with qnew. This is invoked only once per
qnew/qrefresh at most, so there is less performance impact.

This patch also omits "match" argument for "patch.diff()" invocation,
because "patch.diff()" ignores "match" if "changes" is specified.

#!/usr/bin/env python
#
# An example hgweb CGI script, edit as necessary
# See also http://mercurial.selenic.com/wiki/PublishingRepositories

# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = "/path/to/repo/or/config"

# Uncomment and adjust if Mercurial is not installed system-wide
# (consult "installed modules" path from 'hg debuginstall'):
#import sys; sys.path.insert(0, "/path/to/python/lib")

# Uncomment to send python tracebacks to the browser if an error occurs:
#import cgitb; cgitb.enable()

from mercurial import demandimport; demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi
application = hgweb(config)
wsgicgi.launch(application)